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Current Electricity question

2005 · Shift 0 · Q121
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Current Electricity question

2005 · Shift 0 · Q121

JEE MainPhysicsCurrent ElectricityMCQ+4 / −1
Two sources of equal emfemfemf are connected to an external resistance R.R.R. The internal resistance of the two sources are R1{R_1}R1​ and R2(R1>R1).{R_2}\left( {{R_1} \gt {R_1}} \right).R2​(R1​>R1​). If the potential difference across the source having internal resistance R2{R_2}R2​ is zero, then
  1. A
    R=R2−R1R = {R_2} - {R_1}R=R2​−R1​
  2. B
    R=R2×(R1+R2)/(R2−R1)R = {R_2} \times \left( {{R_1} + {R_2}} \right)/\left( {{R_2} - {R_1}} \right)R=R2​×(R1​+R2​)/(R2​−R1​)
  3. C
    R=R1R2/(R2−R1)R = {R_1}{R_2}/\left( {{R_2} - {R_1}} \right)R=R1​R2​/(R2​−R1​)
  4. D
    R=R1R2/(R1−R2)R = {R_1}{R_2}/\left( {{R_1} - {R_2}} \right)R=R1​R2​/(R1​−R2​)
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